diff --git a/packages/core/data_adapters/BaseAdapter.ts b/packages/core/data_adapters/BaseAdapter.ts
index 7edb35eabc..6e7580784e 100644
--- a/packages/core/data_adapters/BaseAdapter.ts
+++ b/packages/core/data_adapters/BaseAdapter.ts
@@ -4,10 +4,7 @@ import { isStateTreeNode, getSnapshot } from 'mobx-state-tree'
 import { ObservableCreate } from '../util/rxjs'
 import { checkAbortSignal, observeAbortSignal } from '../util'
 import { Feature } from '../util/simpleFeature'
-import {
-  AnyConfigurationModel,
-  ConfigurationSchema,
-} from '../configuration/configurationSchema'
+import { AnyConfigurationModel, ConfigurationSchema } from '../configuration'
 import { getSubAdapterType } from './dataAdapterCache'
 import { AugmentedRegion as Region, NoAssemblyRegion } from '../util/types'
 import { blankStats, rectifyStats, scoresToStats } from '../util/stats'
diff --git a/packages/core/ui/ReturnToImportFormDialog.tsx b/packages/core/ui/ReturnToImportFormDialog.tsx
new file mode 100644
index 0000000000..d40534b71e
--- /dev/null
+++ b/packages/core/ui/ReturnToImportFormDialog.tsx
@@ -0,0 +1,78 @@
+import React from 'react'
+import { observer } from 'mobx-react'
+import { makeStyles } from '@material-ui/core/styles'
+import {
+  Button,
+  Dialog,
+  DialogActions,
+  DialogContent,
+  DialogTitle,
+  Divider,
+  IconButton,
+  Typography,
+} from '@material-ui/core'
+import CloseIcon from '@material-ui/icons/Close'
+
+const useStyles = makeStyles(theme => ({
+  closeButton: {
+    position: 'absolute',
+    right: theme.spacing(1),
+    top: theme.spacing(1),
+    color: theme.palette.grey[500],
+  },
+}))
+
+function ReturnToImportFormDialog({
+  model,
+  handleClose,
+}: {
+  model: { clearView: Function }
+  handleClose: () => void
+}) {
+  const classes = useStyles()
+  return (
+    <Dialog maxWidth="xl" open onClose={handleClose}>
+      <DialogTitle>
+        Reference sequence
+        {handleClose ? (
+          <IconButton
+            className={classes.closeButton}
+            onClick={() => handleClose()}
+          >
+            <CloseIcon />
+          </IconButton>
+        ) : null}
+      </DialogTitle>
+      <Divider />
+
+      <DialogContent>
+        <Typography>
+          Are you sure you want to return to the import form? This will lose
+          your current view
+        </Typography>
+      </DialogContent>
+      <DialogActions>
+        <Button
+          onClick={() => {
+            model.clearView()
+            handleClose()
+          }}
+          variant="contained"
+          color="primary"
+          autoFocus
+        >
+          OK
+        </Button>
+        <Button
+          onClick={() => handleClose()}
+          color="secondary"
+          variant="contained"
+        >
+          Cancel
+        </Button>
+      </DialogActions>
+    </Dialog>
+  )
+}
+
+export default observer(ReturnToImportFormDialog)
diff --git a/packages/core/ui/index.ts b/packages/core/ui/index.ts
index a23334b1fe..6a6f29e5e7 100644
--- a/packages/core/ui/index.ts
+++ b/packages/core/ui/index.ts
@@ -1,6 +1,7 @@
 export * from './theme'
 export { LogoFull, Logomark } from './Logo'
 export { default as App } from './App'
+export { default as ReturnToImportFormDialog } from './ReturnToImportFormDialog'
 export { default as ErrorMessage } from './ErrorMessage'
 export { default as AssemblySelector } from './AssemblySelector'
 export { default as FileSelector } from './FileSelector'
diff --git a/packages/core/util/Base1DViewModel.ts b/packages/core/util/Base1DViewModel.ts
index 6338721fdf..4410da675c 100644
--- a/packages/core/util/Base1DViewModel.ts
+++ b/packages/core/util/Base1DViewModel.ts
@@ -1,7 +1,7 @@
 import { types, cast, getSnapshot, Instance } from 'mobx-state-tree'
 import { clamp, viewBpToPx } from './index'
 import { Feature } from './simpleFeature'
-import { Region } from './types/mst'
+import { Region, ElementId } from './types/mst'
 import { Region as IRegion } from './types'
 import calculateDynamicBlocks from './calculateDynamicBlocks'
 import calculateStaticBlocks from './calculateStaticBlocks'
@@ -16,6 +16,7 @@ export interface BpOffset {
 
 const Base1DView = types
   .model('Base1DView', {
+    id: ElementId,
     displayedRegions: types.array(Region),
     bpPerPx: 0,
     offsetPx: 0,
@@ -41,6 +42,11 @@ const Base1DView = types
     get width() {
       return self.volatileWidth
     },
+    get assemblyNames() {
+      return [
+        ...new Set(self.displayedRegions.map(region => region.assemblyName)),
+      ]
+    },
 
     get displayedRegionsTotalPx() {
       return this.totalBp / self.bpPerPx